/*
 jChecs: a Java chess game sample 

 Copyright (C) 2006-2011 by David Cotton

 This program is free software; you can redistribute it and/or modify it under
 the terms of the GNU General Public License as published by the Free Software
 Foundation; either version 2 of the License, or (at your option) any later
 version.

 This program is distributed in the hope that it will be useful, but WITHOUT
 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

 You should have received a copy of the GNU General Public License along with
 this program; if not, write to the Free Software Foundation, Inc., 51 Franklin
 Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */
package fr.free.jchecs.swg;

import java.awt.Dimension;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;

import javax.swing.JComponent;
import javax.swing.JEditorPane;
import javax.swing.JScrollPane;
import javax.swing.ScrollPaneConstants;
import javax.swing.SwingUtilities;

import fr.free.jchecs.core.Game;

/**
 * Composant graphique chargé d'afficher la feuille de la partie.
 * 
 * @author David Cotton
 */
final class ScoreSheet {
	/** Composant graphique externe. */
	private final JComponent _component;

	/**
	 * Construit un nouveau composant d'affichage de la notation.
	 * 
	 * @param pPartie
	 *            Définition de partie liée au composant.
	 */
	ScoreSheet(final Game pPartie) {
		assert pPartie != null;

		final JEditorPane champ = new JEditorPane();
		champ.setContentType("text/html");
		champ.setEditable(false);
		final JScrollPane fond = new JScrollPane(champ,
				ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED,
				ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
		_component = fond;
		fond.getViewport().setPreferredSize(new Dimension(175, 250));
		pPartie.addPropertyChangeListener("position", new ScoreSheetListener(
				pPartie, champ));
	}

	/**
	 * Renvoi le composant graphique affichable.
	 * 
	 * @return Composant graphique.
	 */
	JComponent getComponent() {
		assert _component != null;
		return _component;
	}

	/**
	 * Classe à l'écoute des évènements de la feuille de score.
	 */
	private static final class ScoreSheetListener implements
			PropertyChangeListener {
		/** Référence du champ affichant le score. */
		final JEditorPane _editorPane;

		/** Référence de la partie liée à la feuille de score. */
		private final Game _game;

		/**
		 * Instancie un nouvel écouteur.
		 * 
		 * @param pPartie
		 *            Partie liée.
		 * @param pChamp
		 *            Champ affichant le score.
		 */
		ScoreSheetListener(final Game pPartie, final JEditorPane pChamp) {
			assert pPartie != null;
			assert pChamp != null;

			_game = pPartie;
			_editorPane = pChamp;
		}

		/**
		 * Réagit au changement dans la définition de la partie.
		 * 
		 * @param pEvt
		 *            Evènement signalant le changement. (TRANS - Event signaling the change)
		 */
		@Override
		public void propertyChange(final PropertyChangeEvent pEvt) {
			assert pEvt != null;

			final StringBuilder sb = new StringBuilder("<html>");
			final String[] sans = _game.getSANStrings();
			for (int i = 0; i < sans.length; i++) {
				final String debImp;
				final String finImp;
				if (i % 2 == 0) {
					debImp = "<b>";
					finImp = "</b>";
				} else {
					debImp = "";
					finImp = "";
				}
				final String debShow;
				final String finShow;
				if (i == _game.getCurrentMoveIndex()) {
					debShow = "<font bgcolor=#E0E0FF><a name=\"show\">";
					finShow = "</a></font>";
				} else {
					debShow = "";
					finShow = "";
				}
				sb.append(debImp).append(debShow);
				sb.append("&nbsp;").append(sans[i]);
				sb.append(finShow).append(finImp);
			}
			sb.append("</html>");
			SwingUtilities.invokeLater(new Runnable() {
				/**
				 * Lance la mise à jour dans le thread Swing, pour rester
				 * synchrone.
				 */
				@Override
				public void run() {
					_editorPane.setText(sb.toString());
					_editorPane.scrollToReference("show");
				}
			});
		}
	}
}
